Per-attribute transition properties on MGLStyleLayer (#8225)

* [ios, macos] new struct MGLTransition

* [ios] MGLTransition struct moved to MGLTypes.h

* [ios] MGLTransition implemented for style layer properties

* [ios, macos] added support for getting property transitions

* [ios, macos] updated to MGLDurationFromTimeInterval and MGLTimeIntervalFromDuration

* [ios, macos] added transition properties test

* [ios, macos] modified key strings imp

* [ios, macos] The impl for transition properties were changed to public methods

* [ios, macos] Changelog update

* [ios] Fixed layer space formatting

* [core] The name space was fixed for getters that returned TransitionOptions

* [ios, macos] Added rawLayer transition property tests

* [ios] Added a factory method for MGLTransition and transition-related methods to NSValue(MGLAdditions)

* [ios, macos] Copyedited changelog blurbs about transition properties

1 files changed, 56 insertions, 0 deletions

diff --git a/platform/darwin/src/MGLCircleStyleLayer.h b/platform/darwin/src/MGLCircleStyleLayer.h
index 7a64c25a23..d1d48d65c6 100644
--- a/platform/darwin/src/MGLCircleStyleLayer.h
+++ b/platform/darwin/src/MGLCircleStyleLayer.h
@@ -107,6 +107,13 @@ MGL_EXPORT
  */
 @property (nonatomic, null_resettable) MGLStyleValue<NSNumber *> *circleBlur;
 
+/**
+ The transition affecting any changes to this layer’s `circleBlur` property.
+
+ This property corresponds to the `circle-blur-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleBlurTransition;
+
 #if TARGET_OS_IPHONE
 /**
  The fill color of the circle.
@@ -160,6 +167,13 @@ MGL_EXPORT
 #endif
 
 /**
+ The transition affecting any changes to this layer’s `circleColor` property.
+
+ This property corresponds to the `circle-color-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleColorTransition;
+
+/**
  The opacity at which the circle will be drawn.
  
  The default value of this property is an `MGLStyleValue` object containing an
@@ -185,6 +199,13 @@ MGL_EXPORT
 @property (nonatomic, null_resettable) MGLStyleValue<NSNumber *> *circleOpacity;
 
 /**
+ The transition affecting any changes to this layer’s `circleOpacity` property.
+
+ This property corresponds to the `circle-opacity-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleOpacityTransition;
+
+/**
  Circle radius.
  
  This property is measured in points.
@@ -212,6 +233,13 @@ MGL_EXPORT
 @property (nonatomic, null_resettable) MGLStyleValue<NSNumber *> *circleRadius;
 
 /**
+ The transition affecting any changes to this layer’s `circleRadius` property.
+
+ This property corresponds to the `circle-radius-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleRadiusTransition;
+
+/**
  Controls the scaling behavior of the circle when the map is pitched.
  
  The default value of this property is an `MGLStyleValue` object containing an
@@ -285,6 +313,13 @@ MGL_EXPORT
 #endif
 
 /**
+ The transition affecting any changes to this layer’s `circleStrokeColor` property.
+
+ This property corresponds to the `circle-stroke-color-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleStrokeColorTransition;
+
+/**
  The opacity of the circle's stroke.
  
  The default value of this property is an `MGLStyleValue` object containing an
@@ -310,6 +345,13 @@ MGL_EXPORT
 @property (nonatomic, null_resettable) MGLStyleValue<NSNumber *> *circleStrokeOpacity;
 
 /**
+ The transition affecting any changes to this layer’s `circleStrokeOpacity` property.
+
+ This property corresponds to the `circle-stroke-opacity-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleStrokeOpacityTransition;
+
+/**
  The width of the circle's stroke. Strokes are placed outside of the
  `circleRadius`.
  
@@ -337,6 +379,13 @@ MGL_EXPORT
  */
 @property (nonatomic, null_resettable) MGLStyleValue<NSNumber *> *circleStrokeWidth;
 
+/**
+ The transition affecting any changes to this layer’s `circleStrokeWidth` property.
+
+ This property corresponds to the `circle-stroke-width-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleStrokeWidthTransition;
+
 #if TARGET_OS_IPHONE
 /**
  The geometry's offset.
@@ -383,6 +432,13 @@ MGL_EXPORT
 @property (nonatomic, null_resettable) MGLStyleValue<NSValue *> *circleTranslation;
 #endif
 
+/**
+ The transition affecting any changes to this layer’s `circleTranslation` property.
+
+ This property corresponds to the `circle-translate-transition` property in the style JSON file format.
+*/
+@property (nonatomic) MGLTransition circleTranslationTransition;
+
 @property (nonatomic, null_resettable) MGLStyleValue<NSValue *> *circleTranslate __attribute__((unavailable("Use circleTranslation instead.")));
 
 /**